bluetooth network routing

Hi to all,
I've googled around a bit and haven't found anything really focused on
my problem
what I have:
* xp pro sp2
* digicom bluetooth usb dongle with widcomm drivers installed and working
* sony ericsson t610
* other PCs not involved in this post

Here's my current setup:
pc:
* ethernet card on 10.0.1.2/24 8this is connected to a firewall wich is
10.0.1.1, then to the router 10.0.0.1
* bluetooth lan on 10.0.2.1
* other 2 nics...

What I'd like to do is to setup a route between 10.0.2.0/24, which
includes the t610 (10.0.2.2) and the bluetooth dongle, and the ethernet
nic 10.0.1.2. Then I would like to access the internet from the mobile
using the bluetooth connection instead of my ISP one.

I've tried ICS but I can't reconfigure the entire lan only because MS
wants the IP configured on 192.168.1.1. If I set up a bridge between my
1st nic and the BT one every connection between my pc and the firewall
is interrupted (???)

Any idea on how to do the whole thing ? Any hint will be very appreciated

TIA

Giuliano